Message Example - SMC Networks HECR Series Communications Manual

5.5.2 Message example

The example shows communication with the conditions below.
1)
2)
◼
Communication example
The communication example is expressed in hexadecimal value with
[ ]. The actual communication is performed in ASCII code. Refer to the
request / response message in this section.
Your system
(Request): 010300400001BB [CR][LF]
(Response): 010302094DA4 [CR][LF]
Request message
Code Contents
01 Slave Address
03 Function
0040 Head address of specified register
0001 Quantity of register to read
BB LRC
◼
Request message (Master to Slave)
Start Slave Address
3A
30 31
◼
Response message (Slave to Master)
Start Slave Address
3A
30 31
HECR
MODBUS communication function
Slave Address (=Unit number)：No.1
Read a data from register 0040H.
(Read Internal sensor temperature.)
Function
30 33
Read Address
Hi
30 30 34
Function
30 33
Byte Count
30 32 30
Response message
Code
01 Slave Address
03 Function
02 Quantity of bytes to read
Information of 0040H
094D
(circulating fluid discharge temperature: 23.81
A4 LRC
Data
Quantity to Read
Lo Hi
30 30 30
Data
Read Data1
Hi Lo
39 34 4D
This product
Data is sent and
received in ASCII
code.
Contents
LRC End
42 42 0D
Lo
30 31
LRC End
41 34 0D
o
C)
0A
0A
5-6